This genuine Stihl oil pump, part number 11216403202, is an essential component for maintaining efficient lubrication in Stihl MS290, MS310, MS390, 029, and 039 chainsaws. It ensures proper oil flow to the bar and chain, which is critical for optimal cutting performance and extending the lifespan of the saw's cutting components. Weighing approximately 0.12 kg, this durable oil pump is designed for reliable operation within the chainsaw's lubrication system.